<!DOCTYPE html>
<html>
  <head>
    <style>
      .outermost { border: 2px solid; }
      .outer { border: 4px solid yellow; }
      .inner { border: 6px sold green; }
    </style>
  </head>
  <body>
    <span class="outermost" style="border-right: none">
      <span class="outer" style="border-right: none">
        <span class="inner" style="border-right: none">
        </span>
      </span>
    </span>
    <span style="display: block"></span>
    <span class="outermost" style="border-right: none; border-left: none">
      <span class="outer" style="border-right: none; border-left: none">
        <span class="inner" style="border-right: nonel border-left: none">
          before span
        </span>
      </span>
    </span>
    <span style="display: block">span</span>
    <span class="outermost" style="border-left: none">
      <span class="outer" style="border-left: none">
        <span class="inner" style="border-left: none">
          after span
        </span>
      </span>
    </span>
  </body>
</html>
